Exit-door lock.



H. W. DYER.

EXIT DOOR LOCK.

APPLICATION 111.51) MAY 12, 1911. RENEWED MAY 29,1914.

1,168,792. Patented Jan. 1 1916.

I 1/ Ljfi I 1 1-1 mmusn INVENTOR ATTORNEY r COLUMBIA PLANoamPH 60-,wAsmNu'roM n c I EXIT-DOOR LOCK.

icense) Specification of Letters Patent.

Patented Jan. 18, 1916.

Application filed May 12, 1911, Serial No. 626,809. Renewed May 29,1914.Seria1.No.'841,958.

To all whom it may concern:

Be it known that I, HARRY WV. DYER, a citizen of the United States,residing in East Orange, county of Essex and State of New Jersey, withpost-office address at No. 30 Midlandavenue, have invented certain newand useful Improvements in Exit-Door Locks, of which the following is aspecification. i p

This invention relates to exit door locks, by which term I refer tolocks designed to be opened from the'inside of a dooronly and intendedto operate quickly and certainly in case of panic when pressure isexerted against a part on the door by crowding against the inside.

The primary object of the invention is to provide a simple andinexpensive exit door lock which will be certain in operation and notliable to get out of order.

In the accompanying drawings I have illustrated my invention as embodiedin an exit door lock for double doors and also in an exit door lockspecially adapted to single doors, the principle of operation in bothforms of exit door lock being precisely the same.

In the drawings: Figure 1 is a diagram showing the general arrangementof the parts of the exit door lock in front elevation. Fig. 2 is avertical section on the line A A of Fig. 1. Fig. 3 is a horizontalsection on the line B B of Fig. 1. Fig. 4 is a perspective view indetail of the operating mechanism, the pressure plate being indicated indotted lines.

In the drawings, in which similar letters of reference designatecorresponding parts in the several views, 11 represent doors swingingoutwardly and 22 designate pressure plates mounted 011 the doors as bestshown in Figs. 3 and 4. Each pressure plate is hinged to the door bymeans of a special form of hinge (3), which is provided with a spring(4) to force the hinge leaf (5) normally away from the doors. The hinges(3) are attached to the door adjacent to. their hinged edges and theends of the pressure plates remote from the hinges (3) are secured bymeans of a bracket (6) to the pivot pin (7 of a toggle joint, the arms(8) of which are pivoted to the adjacent extremities of a pair ofsliding locking bolts (9) and disposed vertically on one of the doubledoors. A spring (10) between the toggle joint and the door forces it andthe pressure plate normally as far away from the door as the length ofthe toggle joint links (8) will permit. 1 These links are so arrangedthat pressure of the toggle jointtoward the door will cause the bolts tobe drawn out of engagement with their sockets (11) and the action of thespring (10) in forcingthe toggle joint away from the door is effectivein moving the bolts (9) into engagement with their sockets. From thisdescription and an inspection of Figs. 1, 2, 3, and 4 the operation ofthe exit door lock illustrated in these figures will be obvious. Thenormal position of the parts is clearly shown in all of these figuresand pressure against the plate (2) bearing the legend Push will compressthe spring (10) and the spring (4), lengthen the toggle joint anddisengage the locking bolts from their sockets, thus releasing the doorand allowing it to swing outwardly under the pressure from within.

It is obvious that my improved door lock is formed of a minimum numberof'parts of simple design and which will remain in working order withoutattention, which is highly essential to an article of this character. Itwill also be noted that the direct line of pressure of the bolt ishorizontal whereby the crowding against the plate will be fullyeffective and its action cannot be prevented by an obstacle beneath theplate.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. The combination of a door adapted to swing outwardly, a pressureplate yieldably mounted on said door, a locking bolt for locking saiddoor against outward movement, a link pivoted to said bolt and to saidpressure plate, and a spring pivoted on the pivot pin on which the outerend of the link is pivoted, whereby force applied to said pressure platewill release said locking bolt and when said force is released saidspring will force said locking bolt to its locking 7 to the plate andthe ends of said bolts re- 3. In combination with a door adaptedto swingoutwardly, a pressure plate mounted on said door for movement toward andfrom the'same in a horizontal plane, a pair of bolts mounted forvertical movement on said door and having their inner ends underlyingsaid plate, a link pivoted on said plate and downwardly and outwardlyinclined from its pivotal point, a pivotal connection between the end of.said link and said upper bolt, a similar connection upwardly andoutwardly inclined on said plate through said lower bolt, wherebypressure on saidplate will straighten said links and draw said bo ts.

4. In combination with a door adapted to five cents each, by addressingWashington, D. C.

swing outwardly, a pair of bolts mounted r on said door for engagementwith the door frame at the upper and lower edges of said door, saidbolts having their inner ends adjacent and in overlapping relation, apair of toggle links connected at their opposite ends to the ends ofsaid bolts, and a pressure member mounted on said door andextendinghorizontally across the same and operatively engaging the joint ofsaid-links to straighten said toggle on movement of the pressure membertoward the door.

In testimony whereof, I have signed my name hereto in the presence ofWitnesses.

HARRY w. DYER.

the Commissioner of Patents.

